修改沉浸式状态栏，改为全透明，和头部图片颜色一致

非常简单

在setContentView(R.layout.activity_main);之前设置
View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
getWindow().setStatusBarColor(Color.TRANSPARENT);在setContentView(R.layout.activity